package com.daxt.common.util;

import java.security.MessageDigest;

public class SHA1Util {
	
	private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5',  
	         '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};  
		
		
		private static String getFormattedText(byte[] bytes) {  
			int len = bytes.length;  
			StringBuilder buf = new StringBuilder(len * 2);  
			for (int j = 0; j < len; j++) {  
			buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);  
			buf.append(HEX_DIGITS[bytes[j] & 0x0f]);  
			}  
			return buf.toString();  
		}  
		
		public static String encode(String str) {  
			if (str == null) {  
			return null;  
			}  
			try {  
			MessageDigest messageDigest = MessageDigest.getInstance("SHA1");  
			messageDigest.update(str.getBytes());  
			return getFormattedText(messageDigest.digest());  
			} catch (Exception e) {  
			throw new RuntimeException(e);  
			}  
		}
}
